JP2000092554A - Mobile station device and base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a blank time for receiving a control channel for a different mobile object communication system in an information channel by a mobile station without generating a cause of signal interruption in a radio communication line at the time of hand-over and requiring the additional allocation of a channel resource. SOLUTION: A transmitter-receiver in a base station compresses information for one frame of an information channel into a block less than a half of one frame and transmits the block repeatedly for the one-frame period. A transmitter-receiver in a mobile station decodes a received signal in each block or in each added block unit to detect an error. When an error rate is more than a threshold, a succeeding block is received and added. The operation is repeated unti the error rate becomes less than the threshold. When the error rate becomes less than the threshold, the reception of the information channel is stopped and remaining time up to the lapse of the one-frame period is used for monitoring the carrier information of the mobile object communication system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code D)
The present invention relates to a mobile station apparatus and a base station apparatus of a mobile communication system using an ivision multiple access (ivision multiple access) method.

[0002]

2. Description of the Related Art CDMA (Code Division Multiple Acc)
ess) mobile communication system,
Different schemes (eg FDMA, TDMA, etc.)
Handover to a mobile communication system service (hereinafter simply referred to as a different mobile communication system),
Alternatively, when performing handover to a different carrier frequency in the same CDMA mobile communication system, it is necessary to monitor information on the carrier of the handover destination before performing handover in order to perform handover smoothly.

FIG. 7 is a schematic cell diagram for explaining a situation at the time of handover. Here, it is assumed that there are three cells. When the mobile station 702 connected to the base station 701 moves from the cell 703 to the cell 704, which is a cell of a different mobile communication system, the mobile station 702 receives the control channel transmitted by the base station 705 of the destination cell 704. , Base station 7
It is necessary to monitor the control channel 05.

[0004] Channels used in CDMA mobile communication mainly include a control channel and a communication channel. The control channel is transmitted from the base station to all mobile stations in the same cell. A broadcast channel (BCCH) is mapped in the control channel, and mainly includes information on synchronization, downlink transmission power information, uplink interference power information, and the like. The communication channel is transmitted and received between the base station and the mobile station, and is a channel for data communication which is a message signal.

FIG. 8 is a schematic diagram of a frame structure of a communication channel and a control channel transmitted by a conventional base station apparatus. In the communication channel, for example, a frame in units of 10 msec is further divided into 16 slots, for example, and is used for data communication. The broadcast channel is transmitted, for example, for one frame of 10 msec over the entire frame period.

[0006] If the mobile station receives the signal with such a channel structure, there is no free time for the mobile station to monitor the carrier information of the different mobile communication system. It has been devised.

FIG. 9 is a schematic diagram of a frame structure of a transmission signal of a conventional base station apparatus. FIG. 9A shows a frame structure of a communication channel in normal communication.

The frame structure at the time of monitoring will be described with reference to FIGS. 9 (b) and 9 (c). FIG. 9B shows a frame structure in a case where information for one frame of the communication channel is added and transmitted at a double rate in the first half of one frame. Further, FIG. 9C divides the added information in the case of FIG. 9B into quarters of one frame, and
This is an example of transmitting at the front end and the rear end of one frame.

When the base station transmits a communication channel to the mobile station in such a frame structure, a blank time (hereinafter, referred to as an idle section) occurs in the frame as shown in the figure. The section has no data to receive. Therefore, it is possible to monitor control channels of different mobile communication systems using the idle section in the communication channel.

[0010] Accordingly, the mobile station can establish synchronization at the time of handover based on the received carrier information of the mobile communication system of a different handover destination, so that a smooth handover can be performed.

[0011]

However, the conventional apparatus has the following problems.

That is, in order for a conventional base station to have an idle section for receiving a control channel of a handover destination in a mobile station, a frame is constructed and transmitted so that a communication channel to be transmitted has an idle section. So
The transmission signal from the base station has a blank time during which no data is transmitted, which causes a signal break in the wireless communication line.

Further, the conventional mobile station apparatus cannot perform accurate reception / decoding unless it is previously notified of the timing at which the added high-rate data comes.
It is necessary to allocate a new channel resource for transmitting information on the timing from the base station to the mobile station. Therefore, it becomes difficult to receive carrier information of different mobile communication systems when channel resources are insufficient.

[0014] The present invention has been made in view of the above-mentioned circumstances, and does not cause a signal interruption of a radio communication line at the time of handover and does not require further channel resource allocation. It is an object of the present invention to provide a mobile station apparatus and a base station apparatus that form a blank time for receiving a control channel of a different mobile communication system in a channel.

[0015]

The gist of the present invention is that a base station apparatus compresses information for one frame of a broadcast channel into a block of one half or less of a frame, and this block is used for one frame time. The mobile station apparatus decodes these repeatedly transmitted blocks in block units or added block units, performs error detection, and receives the next block if the error rate is equal to or greater than the threshold value. And repeat this until the error rate is below the threshold,
When the error rate becomes equal to or less than the threshold value, reception of the broadcast channel is stopped, and the remaining time until one frame time elapses is used to monitor control channels of different mobile communication systems for handover. is there.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A base station apparatus according to a first aspect of the present invention comprises: a compression means for compressing broadcast channel data to be transmitted in one frame into blocks of one half or less of one frame; And a transmission unit for repeatedly transmitting the above-described block within one frame transmission time using a broadcast channel.

According to this configuration, the mobile station receiving the broadcast channel transmitted in this way can obtain information for one frame of the broadcast channel without receiving the broadcast channel over one frame time. Therefore, it is possible to secure a blank section until one frame time elapses after acquiring information for one frame of the broadcast channel, and this can be used for, for example, cell search.

A mobile station device according to a second aspect of the present invention comprises:
Data to be transmitted in one frame is one half of one frame
A receiving means for receiving a broadcast channel which is compressed into the following blocks and in which the block is repeatedly transmitted within one frame transmission time, and for each block reception, decodes the received block in block units to detect an error rate And a reception control unit for stopping reception of the data of the remaining broadcast channels in one frame when the detected error rate becomes equal to or less than the threshold value.

According to this configuration, information for one frame of the broadcast channel can be obtained by receiving the minimum necessary data without receiving the broadcast channel over the entire area of one frame time. Can be secured as a blank section until one frame time elapses after the information is acquired, and can be used, for example, for cell search.

A mobile station apparatus according to a third aspect of the present invention comprises:
Data to be transmitted in one frame is one half of one frame
A receiving unit for receiving a broadcast channel in which the block is compressed into the following blocks and the block is repeatedly transmitted within the transmission time of one frame; an integrating unit for integrating the received blocks in block units; Detecting means for decoding the integrated block to detect an error rate;
And receiving control means for stopping reception of data of the remaining broadcast channels in one frame when the detected error rate becomes equal to or less than a threshold value.

According to this configuration, information for one frame of the broadcast channel can be obtained by receiving the minimum necessary data without receiving the broadcast channel over the entire area of one frame time. Can be secured as a blank section until one frame time elapses after the information is acquired, and can be used, for example, for cell search.

[0022] A mobile station apparatus according to a fourth aspect of the present invention comprises:
In the second mode or the third mode, the reception control means may switch the operation from the receiving RF unit during communication to another receiving RF unit when the error rate becomes equal to or less than a threshold value in error detection. To issue a switching instruction.

According to this configuration, it is possible to suspend the reception of the broadcast channel by disabling the reception RF unit that has been responsible for the reception of the broadcast channel, and to activate the reception RF unit by operating another reception RF unit. The reception of another channel, for example, a control channel of a candidate for a handover destination for cell search, can be received using a blank section formed by stopping the channel reception.

[0024] The mobile station apparatus according to the fifth aspect of the present invention comprises:
In any one of the second aspect to the fourth aspect, a configuration comprising a cell search means for monitoring a control channel of another base station using a blank time in one frame of the broadcast channel formed by the reception control means. take.

According to this configuration, since the control channel of the control channel of another base station can be monitored using the blank section, a cell search can be performed and a smooth handover can be performed.

A sixth aspect of the present invention is a mobile communication system including the base station apparatus according to the first aspect and the mobile station apparatus according to any of the second to fifth aspects. .

According to this configuration, the mobile station can use a different control channel of the mobile communication system in the broadcast channel without causing a signal interruption in the wireless communication line and without requiring further channel resource allocation. A blank time for receiving can be formed.

A signal transmission method for a base station apparatus according to a seventh aspect of the present invention is to compress data of a broadcast channel to be transmitted in one frame into blocks that are equal to or less than half of one frame. Is repeatedly transmitted within the transmission time of one frame using the broadcast channel.

According to this method, the mobile station receiving the broadcast channel transmitted in this way can obtain information for one frame of the broadcast channel without receiving the broadcast channel over one frame time. Therefore, it is possible to secure a blank section until one frame time elapses after acquiring information for one frame of the broadcast channel, and this can be used for, for example, cell search.

In the broadcast channel receiving method for a mobile station apparatus according to an eighth aspect of the present invention, data to be transmitted in one frame is compressed into a block of one half or less of one frame.
A broadcast channel in which the block is repeatedly transmitted within the transmission time of the frame is received, and the received block is decoded for each block and the error rate is detected for each block, and the error rate is reduced to a threshold value or less. When this happens, the reception of data of the remaining broadcast channels within one frame is stopped.

According to this method, the information of one frame of the broadcast channel can be obtained by receiving the minimum necessary data without receiving the broadcast channel over the entire area of one frame time. Can be secured as a blank section until one frame time elapses after the information is acquired, and can be used, for example, for cell search.

In the broadcast channel receiving method of the mobile station apparatus according to the ninth aspect of the present invention, data to be transmitted in one frame is compressed into a block of one half or less of one frame.
Receives a broadcast channel in which the block is repeatedly transmitted within the transmission time of a frame, integrates the received blocks in block units, decodes the integrated block every time one block is integrated, detects an error rate, When the error rate becomes equal to or less than the threshold value, reception of data of the remaining broadcast channels in one frame is stopped.

According to this method, the information of one frame of the broadcast channel can be obtained by receiving the minimum necessary data without receiving the broadcast channel over the entire area of one frame time. Can be secured as a blank section until one frame time elapses after the information is acquired, and can be used, for example, for cell search.

[0034] In the cell search method for a mobile station apparatus according to the tenth aspect of the present invention, the data to be transmitted in one frame is one.
A broadcast channel in which the block is compressed to a half or less of a frame and the block is repeatedly transmitted within a transmission time of one frame is received, and an error rate of data of one frame of the broadcast channel becomes equal to or less than a threshold value. At this point, the receiving RF unit in communication is switched to another receiving RF unit, the remainder of one frame of the broadcast channel is set as a blank section, and the control channel of the handover destination candidate is monitored using this blank section. .

According to this method, the broadcast channel reception can be stopped by disabling the reception RF unit which has been responsible for broadcast channel reception, and the broadcast can be stopped by operating the other reception RF units. The reception of another channel, for example, a control channel of a candidate for a handover destination for cell search, can be received using a blank section formed by stopping the channel reception.

FIG. 1 shows a frame structure of a communication channel transmitted from a base station apparatus and a frame structure of a broadcast channel mapped to a control channel and transmitted in a base station apparatus according to one embodiment of the present invention. FIG. FIG. 1A shows a conventional frame structure for comparison, and FIG. 1B shows a frame structure according to the present embodiment.

In the conventional device, the broadcast channel is transmitted over the entire 10 msec section of one frame. In the present embodiment, the information of one frame is repeatedly transmitted at least twice the rate for 10 msec. It has a structure. The base station apparatus according to the present embodiment forms a block for each frame of information transmitted at least twice this rate, and the mobile station apparatus also performs decoding in units of this block.

In this embodiment, for example, when information of a broadcast channel for one frame is transmitted at a double rate,
Information of one frame, that is, one block can be sent in 5 msec. Then, this block is repeatedly transmitted twice within one frame of 10 msec. Also, for example,
When transmitting information for one frame at a 16-fold rate, that is, when the time of one block is set to 1/16 of the time of one frame, the same block is repeatedly transmitted 16 times within 10 msec of one frame.

As described above, the base station apparatus adopts a frame configuration in which the same information compressed in one frame as described above is repeatedly transmitted, so that a blank time is generated in a signal transmitted from the base station. No signal interruption occurs. In addition, since the mobile station apparatus can obtain information of one frame by receiving only one block in the minimum case, the mobile station apparatus secures the remaining time until 10 msec of one frame elapses as an idle section and performs handover. The control channel of the first candidate base station can be monitored.

Next, a method in which the mobile station device forms an idle section will be described with reference to FIGS. FIG. 2 is a block diagram of a main part of the mobile station apparatus according to the present embodiment, and FIG. 3 is a flowchart illustrating an idle section forming process of the mobile station apparatus according to the present embodiment.

First, the configuration will be described with reference to FIG. The antenna 201 receives the RF signal and sends it to the RxRF unit 203 via the RxRF switching unit 202 described later. RxRF
Unit 203 drops the received signal from the carrier frequency to the baseband frequency. Further, the A / D converter 204 converts the signal into a digital signal, and the RAKE combining / demodulating unit 205 performs RAKE combining.

Next, the different system control channel reading section 20
The received signal that has entered 0 enters the block data memory 206. There are n block data memories 206, and the first block data memory is at least two blocks from the base station apparatus.
The data of the first block of the broadcast channel repeatedly transmitted at double rate is stored. The n block data memories are sequentially stored for each block in one frame. n can be arbitrarily determined. As will be described in detail later, since n needs to be equal to or more than the number of blocks in one frame, the minimum value of n is determined by how many times the base station apparatus transmits data. The block data memory storage control unit 207 stores the data of each block in the block data memory 206.

The block decoding unit 208 receives the block data memory 206 or the block addition data memory 2 described later.
12 is decrypted. This decoding is performed in block units or in added block units.

The error detection unit 209 performs error detection on the decoded data, and outputs the detection result to the block data memory storage control unit 207, an addition control unit 210, an in-frame control channel read control unit 216, and an RxRF selection control unit. Notifying unit 213.

There are n-1 adders 211 and the block data memory 206 or the block data addition memory 21
2 are added to each other and stored in the block data addition memory 212. The addition control unit 211 sends the data that has been added and stored in the block addition data memory 212 to the block decoding unit 208 for decoding. In order to reduce the size of the device, the block data memory 20
6, one adder 211 and one addition data memory 212 may be provided, in which case they are used repeatedly.

When the RxRF selection control unit 213 receives a notification from the error detection unit 209 that the error rate is equal to or less than the threshold value, it switches the RxRF switching unit 202 and activates the RxRF unit 214 for a different system. That is, RxRF
The reception of the broadcast channel using the unit 203 is stopped. The demodulation processing unit 215 for a different system is provided with an RxRF for a different system.
The control channel of the different system received by the unit 214 is subjected to A / D conversion, demodulation processing, and decoding as necessary.

Intra-frame control channel read controller 216
Receives the notification that the error rate is equal to or less than the threshold from the error detection unit 209, and activates the intra-frame control channel reading unit 217. The intra-frame control channel reading section 216 reads the control channel of the handover destination candidate demodulated from the demodulation processing section 215 for a different system.

Next, the procedure for forming an idle section will be described with reference to FIG. In ST301, antenna 201
Receives a broadcast channel repeatedly transmitted at least twice the rate from the base station. Next, ST302
In the block decoding unit 208, the first block stored in the first block data memory 206 is decoded.

In ST 303, error detecting section 209 performs error detection on the decoded first block. If the error rate is equal to or greater than the threshold, the process proceeds to ST304, and if it is equal to or less than the threshold, the process proceeds to ST305.

In ST 304, upon receiving the instruction that the error rate is equal to or greater than the threshold, block data memory storage control section 207 transmits the data of the second block during or after demodulation in RAKE combining / demodulating section 205. The data is stored in the second block data memory 206. Then, the first adder 210 stores the data stored in the first block data memory 206 and the second block data memory 2
The data stored in 06 is added and stored in the first block addition data memory 212. Addition control unit 21
1 sends the addition result stored in the first block addition data memory 212 to the block decoding unit 208.

When the process of ST304 is completed, S
Returning to T302, the first block addition data memory 2
The data stored in No. 12 is decoded by the block decoding unit 208, and the process proceeds to ST303 to perform error detection. If the error rate is equal to or greater than the threshold, the process proceeds to ST304 again, and if the error rate is equal to or less than the threshold, the process proceeds to ST305.

Steps ST302 to ST304 are repeated until the error rate becomes equal to or less than the threshold value. ST after the second time
At 304, the block data memory storage control unit 2
In step 07, the data of the next block (x-th block) during or after demodulation in the RAKE combining / demodulating unit 205 is stored in the x-th block data memory 206. Then, the x-th adder 211 adds the data of the (x−1) -th block addition memory 212 and the (x + 1) -th block data memory 206 and stores the result in the x-th block addition memory 212. The addition control unit 210 sends the addition result stored in the first block addition data memory 212 to the block decoding unit 208.

In ST 305, it is determined that the necessary data for one frame of the broadcast channel has been received, and the reception of the broadcast channel is stopped. That is, when R is notified from the error detection unit 209 that the error rate is equal to or less than the threshold,
The xRF unit selection control unit 213 switches the RxRF switching unit 202 to operate the RxRF unit 214 for a different system. Therefore, the remaining time until one frame time elapses is secured as an idle section, and the control channel of the handover destination candidate is monitored.

Here, for example, when the error rate is equal to or less than the threshold value when the head block is decoded and the RxRF unit is switched, the RxRF unit 203 receives the head block after receiving the head block until the RxRF unit is switched. The broadcast channel data is discarded when the error detection unit 209 outputs a result indicating that there is no error.

As described above, since the base station apparatus repeatedly transmits a block in which broadcast channel information for one frame is compressed in one frame, the mobile station apparatus which receives the block only receives one block in the minimum case. , One frame of information can be obtained. By stopping reception of the broadcast channel when it is confirmed that information for one frame of the broadcast channel has been obtained, the remaining time until one frame time elapses can be set as an idle section. Therefore, error detection is performed block by block. If the error rate is below the threshold, reception is stopped. If the error rate is above the threshold, the next block having the same information is added, and the error rate is below the threshold. Blocks are successively received and added until.

In this way, the reception of information for one frame can be completed in as few blocks as possible, that is, in a time as short as possible, and the remaining time in one frame can be secured as an idle section for cell search.

For example, one frame is set to 10 msec,
The base station apparatus repeatedly transmits the broadcast channel at a quadruple rate, that is, transmits four blocks at a rate of 2.5 msec per block, and the mobile station apparatus receives the head block without error, and from when the reception of the head block is completed to when the RxRF unit is switched. 1
If msec is required, 6.5 msec until one frame time elapses can be set as an idle section.

The length of the idle section formed as described above depends on how many times the base station apparatus transmits the broadcast channel and how many blocks the mobile station apparatus receives depending on the line quality at that time. And the processing time required for error detection and switching of the RxRF unit.

When one frame time has elapsed, the broadcast channel is received again. The idle section is formed in the same manner after the next frame time.

Next, the operation of synchronizing the mobile station apparatus according to the present embodiment with handover to a different mobile communication system using the above-described idle section will be described with reference to FIG. FIG. 4 is a main block diagram of the mobile station apparatus according to the present embodiment. The same reference numerals are used for the configuration described with reference to FIG.

The RAKE combining / demodulating unit 2
Since the description up to 05 has already been described, it is omitted. When the different system control channel reading unit 200 determines that the error rate has become equal to or less than the threshold value and that one frame worth of broadcast channel data has been received, the RxRF unit selection control unit 213 sets the RxR unit selection control unit 213 to the RxR unit.
F switching unit 202 for switching to different system RxRF unit 2
14 is operated.

In the different system control channel reading unit 200, the intra-frame control channel reading unit 217 described with reference to FIG. 2 reads the control channel of the different system in the formed idle section. The read information on the control channel of the different system is sent to the different system control channel read timing control unit 401, and a timing control instruction is returned. The different system control channel reading unit 200 instructs the read timing to the different system synchronization unit 402.

Thus, by receiving and synchronizing the control channel of the different system, a communication line with the different system can be established. Note that, even when the handover destination is the same mobile communication system, the control channel of the system may be received in the idle section formed as described above, so that it is clear that the present invention is effective.

As described above, the different mobile communication system here is the FDM even if it is a TDMA system.
Even if the system is the A system, any other system that uses mobile communication may be used.

For example, a PH using the TDMA system
S (Personal Handyphone Sys)
tem), in the TDMA system, when reading a control channel, a specific time slot of a specific frequency has to be read. Therefore, the different system control channel read timing control unit 40
1 controls the different system control channel reading unit 200 to read a specific time slot of a specific frequency.

Next, referring to FIG. 5, when the mobile station apparatus according to the present embodiment performs handover to a different mobile communication system using the formed idle section, different mobile communication destinations to be handed over are used. An operation for performing antenna diversity in the system will be described.
FIG. 5 is a main block diagram of the mobile station apparatus according to the present embodiment. The same reference numerals are used for the configurations described with reference to FIGS.

A plurality (n) of antennas 501 are provided. Since the components from the RxRF switching unit 202 to the RAKE combining / demodulating unit 205 have already been described, their description is omitted. When the different system control channel reading unit 200 determines that the error rate has become equal to or less than the threshold value and that data of the broadcast channel for one frame has been received, the RxRF unit selection control unit 213
Switches the RxRF switching unit 202 and switches to the Rx
The RF unit 214 is operated to start receiving a control channel of a different system.

Different system control channel reception strength memory 5
02 is provided with the same number (n in this case) as the antennas 501 and accumulates the level of the control channel of the different system to be handed over for each antenna during cell search using the formed idle section. I do.

The different system reception strength comparing section 503 stores the # 1 to #n of the different system control channel reception strength memory 502.
, And compares the levels of the respective antennas stored in the..., And outputs the result to the antenna selection control unit 504. The antenna selection control unit 504 instructs the antenna selection unit 505 to use a signal from the highest level antenna.

As described above, by performing the antenna diversity when performing the cell search using the formed idle section, it is possible to prevent the line quality from being rapidly deteriorated when handing over to a different mobile communication system. be able to.

It should be noted that instead of the above-mentioned reception strength, SIR
(Signal to Interference R
atio; signal wave to interference wave ratio). Further, even when the handover destination is the same mobile communication system, the control channel of the system need only be received in the idle period, so that it is clear that the present invention is effective.

In the above description, the concept of a block in which information of one frame of a broadcast channel is compressed has been described. The actual slot structure will be described below with reference to an example.

The example of the slot structure shown in FIG.
In the mobile communication system of the / TDD system, broadcast channel information for one frame is compressed into one time slot and transmitted once per subframe, that is, four times per frame.

FIG. 6 is a schematic diagram showing a broadcast channel structure for a public service when the number of subframes is 4, and each base station apparatus transmits broadcast channel information 60 to be transmitted.
1 is transmitted only in the last downlink slot of a subframe, and the same information is repeatedly transmitted in the last downlink slot of all subframes. In this broadcast channel information, information A to D for communication terminal apparatuses BS # 1 to BS # 4 is compressed and stored in the last downlink slot.

In this case as well, similarly to the case described using the concept of a block, the broadcast channel information of the last downlink slot of the first subframe is received, decoded, and error detection is performed. For example, the remaining downlink slots of one frame can be used for monitoring the control channel of the handover destination candidate.

As described above, the transmission / reception device of the base station repeatedly transmits information for one frame of the broadcast channel at least twice or more for one frame time, so that there is a blank time in the transmission signal. Eliminates the possibility of signal loss and eliminates the need to allocate channel resources to obtain the timing of the added and fast transmitted data in the transmitted signal. On the other hand, the transmission / reception device of the mobile station receives and adds the information of one frame repeatedly transmitted until no error is detected, and stops the reception when no error is detected. One frame time elapses after the reception is stopped. The carrier information of different mobile communication systems for handover can be monitored for the remaining time until the cell search, and cell search and accompanying handover can be performed smoothly.

[0077]

As described above, according to the present invention,
At the time of handover, there is no space for the mobile station to receive a control channel of a different mobile communication system in the broadcast channel without causing a signal loss of the wireless communication line and without requiring further channel resource allocation. Time can be formed.

[Brief description of the drawings]

FIG. 1A is a schematic diagram illustrating a conventional frame structure of a broadcast channel transmitted from a base station. FIG. 1B is a schematic diagram illustrating a frame structure of a broadcast channel transmitted from the base station according to one embodiment of the present invention. Figure

FIG. 2 is a block diagram of a main part of the mobile station apparatus according to the embodiment.

FIG. 3 is a flowchart illustrating an idle section forming process of the mobile station apparatus according to the above-described embodiment.

FIG. 4 is a block diagram of a main part of the mobile station apparatus according to the embodiment.

FIG. 5 is a block diagram of a main part of the mobile station apparatus according to the embodiment.

FIG. 6 is a schematic diagram showing an example of a broadcast channel structure according to the embodiment.

FIG. 7 is a schematic diagram of a cell for explaining a situation at the time of handover;

FIG. 8 is a schematic diagram of a frame structure of a communication channel and a control channel transmitted by a conventional base station apparatus.

9A is a schematic diagram of a frame structure of a transmission signal during normal communication of a conventional base station device. FIG. 9B is a schematic diagram of a frame structure of a transmission signal at the time of monitoring of the conventional base station device. Schematic diagram of the frame structure of the transmission signal when monitoring the base station device

[Explanation of symbols]

 200 Different system control channel reading unit 206 Block data memory 207 Block data memory accumulation control unit 208 Block decoding unit 209 Error detection unit 210 Addition control unit 211 Adder 212 Block data addition memory 213 RxRF selection control unit 214 RxRF unit for different system 215 Different-system demodulation processing unit 216 In-frame control channel read control unit 217 In-frame control channel read unit 401 Different system control channel read timing control unit 402 Inter-system synchronization unit 501 Antenna 502 Different system control channel reception strength memory 503 Different system reception Strength comparison unit 504 Antenna selection control unit 505 Antenna selection unit 601 Broadcast channel information

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kitade 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Kazuyuki Miya Tsunashima, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. (3-1) Higashi 4-chome Matsushita Communication Industrial Co., Ltd. (72) Inventor Mitsuru Uesugi 4-3-1 Tsunashima Higashishima, Kohoku-ku, Yokohama, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. (72) Inventor Osamu Kato Yokohama, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. F-term (reference) 5K067 AA11 CC10 EE02 EE10 EE24 JJ13 JJ36 JJ39

Claims (10)

[Claims] A compression means for compressing data of a broadcast channel to be transmitted in one frame into a block equal to or less than half of one frame, and within a transmission time of one frame using the broadcast channel in the compressed channel. And a transmitting means for repeatedly transmitting. 2. A receiving means for receiving a broadcast channel in which data to be transmitted in one frame is compressed into a half or less block of one frame and the block is repeatedly transmitted within a transmission time of one frame. Detecting means for decoding the received block in units of a block every time one block is received and detecting an error rate; and detecting data of the remaining broadcast channels in one frame when the detected error rate becomes equal to or less than a threshold value. A mobile station device comprising: reception control means for stopping reception. 3. Receiving means for receiving a broadcast channel in which data to be transmitted in one frame is compressed into a half or less block of one frame, and the block is repeatedly transmitted within a transmission time of one frame. Integrating means for integrating the received blocks in block units; detecting means for decoding the integrated blocks each time one block is integrated to detect an error rate; and detecting the error rate below a threshold value. And a reception control means for stopping reception of data of the remaining broadcast channel in one frame at a time. 4. The reception control unit according to claim 1, wherein when the error rate becomes equal to or less than a threshold value in the error detection, the reception control unit performs communication reception RF.
4. The mobile station device according to claim 2, wherein a switching instruction is issued to a switching unit that switches operation from the unit to another reception RF unit. 5. A cell search means for monitoring a control channel of another base station by using a blank time in one frame of a broadcast channel formed by the reception control means. 5. The mobile station device according to any one of 4. 6. The base station device according to claim 1, wherein:
A mobile communication system, comprising: the mobile station device according to claim 5. 7. The broadcast channel data to be transmitted in one frame is compressed into a half or less block of one frame, and the compressed block is repeatedly transmitted within one frame transmission time using the broadcast channel. A signal transmission method for a base station apparatus, comprising: 8. A broadcast channel in which data to be transmitted in one frame is compressed into a half or less block of one frame, and the block is repeatedly transmitted within a transmission time of one frame, and one block is received. Each time, the received block is decoded in block units to detect an error rate, and when the error rate becomes equal to or less than a threshold value, reception of data of the remaining broadcast channels in one frame is stopped. A broadcast channel receiving method of a mobile station device to perform. 9. A broadcast channel in which data to be transmitted in one frame is compressed into a half or less block of one frame, and the block is repeatedly transmitted within a transmission time of one frame, and the received block is received. Is integrated in units of blocks, and each time one block is integrated, the integrated block is decoded to detect an error rate. When the error rate becomes equal to or less than a threshold value, the data of the remaining broadcast channel in one frame A broadcast channel receiving method for a mobile station device, characterized by stopping reception of a broadcast channel. 10. A broadcast channel in which data to be transmitted in one frame is compressed into a block equal to or less than half of one frame and the block is repeatedly transmitted within a transmission time of one frame. When the error rate of the data for the frame becomes equal to or less than the threshold value, the receiving RF unit in communication is switched to another receiving RF unit and broadcast channel 1
A cell search method for a mobile station apparatus, characterized in that a remaining section of a frame is a blank section and a control channel of a handover destination candidate is monitored using the blank section.